Practice Test Geeks(ATT) ACI Aggregate Testing Technician Practice Test
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Fine Aggregate Quality Tests Flashcards

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  1. ASTM C33 limits the amount of material finer than the No. 200 sieve in fine aggregate used in concrete subject to abrasion to a maximum of:

    Answer: 3.0%

    For concrete subject to abrasion, ASTM C33 limits fines passing the No. 200 sieve to 3.0% by mass; the limit is 5.0% for other concrete.

  2. When conducting a sieve analysis, mechanical shaking time for fine aggregate per ASTM C136 must be sufficient so that no sieve retains more than what mass per area?

    Answer: 200 g per sq. ft (2.2 kg/m²)

    ASTM C136 requires shaking until no more than 0.5% by mass of the total original dry sample passes any sieve per additional minute, with an upper retained mass limit of 200 g/ft².

  3. In the ASTM C128 pycnometer method for fine aggregate specific gravity, the flask is filled with aggregate and water to the calibration mark and then:

    Answer: Weighed after agitating to eliminate air bubbles

    After filling to the mark, the pycnometer is rolled and inverted to remove entrapped air, then brought to test temperature before weighing.

  4. Which condition best describes 'friable particles' as tested in ASTM C142?

    Answer: Particles that crumble when squeezed between thumb and forefinger while wet

    Friable particles are those that disintegrate under modest hand pressure when wetted, as defined in ASTM C142.

  5. The bulk specific gravity (SSD basis) of fine aggregate is used primarily in concrete mix design to:

    Answer: Calculate absolute volume of aggregate in a mix

    SSD specific gravity allows the mix designer to calculate the absolute volume the aggregate occupies in a unit volume of concrete.

  6. According to ASTM C33, the maximum loss for fine aggregate in the sodium sulfate soundness test is:

    Answer: 10%

    ASTM C33 limits weighted average loss of fine aggregate after 5 cycles in sodium sulfate to a maximum of 10% by mass.

  7. When running the ASTM C40 organic impurities test, the sample is placed in a bottle with sodium hydroxide and allowed to stand for:

    Answer: 24 hours before color comparison

    The NaOH-aggregate mixture must stand for 24 hours so organic compounds fully dissolve into solution before comparing color to the standard.